The Sanyo M9998LU is a large, high-end vintage stereo boombox/ghettoblaster from around 1979–1981, made in Japan for the European market. Today it’s considered one of the better early “pre-disco / silver era” boomboxes. Description The M9998LU was a premium Sanyo portable stereo with: large 2-way speakers analog tuner full stereo cassette deck Dolby noise reduction AMSS music search system multiple radio bands strong amplifier section for its era Key features: FM / MW / LW / SW radio bands Dolby B for recording/playback Metal / CrO₂ / Normal tape support Dual VU meters Stereo Wide effect External mic inputs AUX / DIN connections 2 × 8W RMS output Runs on mains or 10 D batteries Weight around 9 kg The “LU” version was the European export variant: Long Wave band added slightly different tuner layout DIN connectors for European equipment Sound quality For an early boombox, it sounds surprisingly powerful and warm: strong bass wide stereo image clean FM tuner good cassette playback